Hop aboard to travel overseas (6)

I believe the answer is:

abroad

I'm a little stuck... Click here to teach me more about this clue!

'overseas' is the definition.
(synonyms)

'hop aboard to travel' is the wordplay.
'aboard' can be anagrammed to 'ABROAD'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for abroad that I've seen before include "Europe, for example" , "to France, maybe" , "Overseas; (of rumour) widely current" , "in the field" , "in Paris, perhaps" .)

I've seen this clue in The Irish Times.

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